February 2003
Intermediate to advanced
352 pages
9h
English
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Understanding and Using Julian Dates
Get to know and use Julian Dates.
Date-based searching good! Date-based searching with Julian dates annoying (for a human, anyway)!
The Julian date is the number of days that have passed since January 1, 4713 BC. Unlike Gregorian dates, which begin at midnight, Julian days begin at noon, making them useful for astronomers.
A Julian date is just one number. It’s not broken up into month, day, and year. That makes it problematic for humans but handy for computer programming, because to change dates, you simply have to add and subtract from one number, and not worry about month and year changes.
To use Google’s date-range syntax in Perl, you’ll need a way to convert the computer’s local time to Julian. You can use the module Time::JulianDay, which offers a variety of ways to manipulate local time in Julian format. You can get the module and more information at http://search.cpan.org/search?query=Time%3A%3AJulianDay.
Hacks that use the Julian date format and date-range searching pop up throughout this book; start by learning more about using the date-range syntax [Hack #11]. Also included are hacks for building recent searches into a customized form [Hack #42], and date-range searches with a client-side application [Hack #60].
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.